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Finding the Fourth Proportional to 885.41, 1,221.99 and 637.55

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Solution

The fourth proportional to 885.41, 1,221.99 and 637.55 is: 879.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    885.41 : 1,221.99 = 637.55 : x
  2. Step 2: Convert to fraction form
    885.41/1,221.99 = 637.55/x
  3. Step 3: Cross multiply
    885.41x = 1,221.99 × 637.55
  4. Step 4: Simplify right side
    885.41x = 779,073.61
  5. Step 5: Solve for x
    x = 779,073.61/885.41
  6. Step 6: Final answer
    x = 879.91

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.